Gael georg dahlgren and john hugo svensson



(No Model.)

C. G. DAHLGREN 8v J. H. SVBNSSON.

ELECTRIC SWITCH. y

No. 455,837. Patented July 14, 1891.

M42/boss es armenio 1w norma viren: no., pHoro-mno., wAsumnroN u c UNITED STATES PATENT OFFICE.

CARL GEORG DAHLGREN AND JOHN HUGO SVENSSON, OF GOTHENBURG,

SVEDEN.

ELECTRio SWITCH.

SPECIFICATION forming part of Letters Patent No. 455,837, dated July 14, 1891. Application filed December 24, 1890. Serial No. 375,762. (No model.) y

To all whom it may concern:

Be it known that ive, CARL GEORG DAHL- GREN and JOHN HUGO SvENssoN, both subjects of the King of Sweden, residing at Gothenburg, in Sweden, have invented acertain new and useful Improvement in Electrical Switches, of which the following is a specification.

This invention relates to electrical switches; and it consists in a switch of improved construction adapted both to make and to break contact instantaneously.

Reference being made to the accompanying drawings, Figure 1 is a central vertical section through the improved switch on line A A, Fig. 3. Fig. 2 is a side elevation thereof, looking from the left upon Fig. 3. Fig. 3 is a horizontal section on line B B, Fig. 1, showing the parts in the position of this figure and of Fig. 2. Fig. 4 is a similar horizontal position, showing the parts in the position of contact made. Fig. 5 is a horizontal section illustrating the construction of part of the switch on line C C, Fig. 1.

According to this invention the moving contact-plate is adapted to be brought into contact with or out of contact with the iixed contact-plate by means of a spring which normally not in a state of tension is tensioned in the one or other direction by the turning of the turn-button, the shaft of which also serves as a temporary detent for holding the said moving contact-plate in its respect-ive first position until sufficient tension has been given to the spring by turning the button to cause it, when released by the turning of the button, to leap from its posit-ion of contact to its position of disconnection, or vice versa, and thus suddenly interrupt or make contact with the fixed contact-plate.

The drawings illustrate the construction.

a is the insulating-base of the switch.

b is the fixed contact-plate, which may be forked, as in Fig. 2, to make Contact above and below the moving contact-plate.

b is the binding and fixing screw thereof.

c is the metallic plate fastened to the base by the binding and xing screw band carrying a socket let into a pit in the base to receive the spindle of the turn-button.

c' is the moving contact-plate, which is piv oted at 7L in the metallic plate c and is in electrical connection therewith through its metallic pivot-screw.

d is the shaft of the turn-button, c the turnbutton, and g the spring carried by the sleeve f, surrounding the upper part of the shaft d.

It is the cover-plate.

The shaft d is cut away at opposite sides at cl', Figs. l and 3, at the part where it passes through the plate i. The latter is made with two circular holes c" t2, of equal diameter, the same as the longer measurement of the part d', so that the latter can turn within either of the holes c" i2, the first ot' which corresponds to the position of contact, the second to the position of disconnection. The two holes "L" c2 are connected by the passage i3, the breadth of which is but slightly larger than the smaller measurement of the part d. The end of the plate t' is provided with the lug i* to receive the end of the spiral spring g, the other end of which is connected to the turnbutton. The parts being in the position of Fig. 4, by turning the button e to the right the spring gis brought into tension in the direction of the arrow, Fig. 4t. After the turning of the button has been continued sufn'ciently to enable the part d to pass through the passage s the tension of the, spring g will throw the plate z' into the position shown in Fig. 3, and the part d will now be located in the 11olez'2. The turn-button, being now released, will revolve in the hole i2 bythe recoil of the spring until the latter again arrives in its position of rest without tension. If now the turn-button be turned by hand in the reverse direction to that in which it was formerly turned, the spring will in a similar manner be brought into tension in the opposite direction by its uncoiling until the tension is sufficient (the part d being turned to pass through the passage 3) to cause the switch to return to its original position. On release of the turn-button the latter will again spring back under influence of the remaining tension in the spring until the latter ceases to exert pressure in either direction on the switch. The form of spring is immaterial. A spring having the form of avolute when free of tension may be used. The point m on the lower flange of the sleeve f and the lugs l Zon the sides of the plate fare connected to said turn-button and to said to prevent the button being turned too far, by plate c', Iche Whole substantially as and for which the spring might be broken or injured. lche purpose set forth.

We claim- In Witness whereof we have rsigned this 15 5 In an electrical switch, the combination of specification in presence of two Witnesses.

a fixed contact-plate, a moving contact-plate A CARL GEORG DAHLGREN. c plvoted eccentrlcally with reward to the aixis of the turn-button, holes 2 in said JOHN HUGOSVENbbON plate, a. passage "is, connecting` said holes, a/ Witnesses:

1o turn-button and spindle thereto, a dimin- ERNEST A. MAN,

ished part d on said spindle, and a spring g, HUGO ARWICKSON. 

